medial forebrain bundle in dogs

The Medial forebrain bundle (MFB), is a complex bundle of axons coming from the basal olfactory regions, the periamygdaloid region, and the septal nuclei, and passing to the lateral hypothalamus, with some carrying on into the tegmentum. It contains both ascending and descending fibers. It also represents a part of the mesolimbic pathway, carrying information between the ventral tegmentum and the nucleus accumbens. It is commonly accepted that the MFB is a part of the reward system, involved in the integration of reward and pleasure. Electrical stimulation of the medial forebrain bundle is believed to cause sensations of pleasure. This hypothesis is based upon intracranial self-stimulation (ICSS) studies. Animals will work for MFB ICSS, and humans report that MFB ICSS is intensely pleasurable. This is most likely because the medial forebrain bundle carries information from the ventral tegmental area (VTA) to the nucleus accumbens (nAcc or Acb). The nAcc is a recognized reward center, and activation of the pathway from the VTA to the nAcc is believed to be rewarding, which is why it is sometimes referred to as the hedonic highway. [WP,unvetted]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the medial forebrain bundle is

The Medial forebrain bundle (MFB), is a complex bundle of axons coming from the basal olfactory regions, the periamygdaloid region, and the septal nuclei, and passing to the lateral hypothalamus, with some carrying on into the tegmentum. It contains both ascending and descending fibers. It also represents a part of the mesolimbic pathway, carrying information between the ventral tegmentum and the nucleus accumbens. It is commonly accepted that the MFB is a part of the reward system, involved in the integration of reward and pleasure. Electrical stimulation of the medial forebrain bundle is believed to cause sensations of pleasure. This hypothesis is based upon intracranial self-stimulation (ICSS) studies. Animals will work for MFB ICSS, and humans report that MFB ICSS is intensely pleasurable. This is most likely because the medial forebrain bundle carries information from the ventral tegmental area (VTA) to the nucleus accumbens (nAcc or Acb). The nAcc is a recognized reward center, and activation of the pathway from the VTA to the nAcc is believed to be rewarding, which is why it is sometimes referred to as the hedonic highway. [WP,unvetted]. The atlas records it as a nerve at the organ scale in the dog.

Where the medial forebrain bundle is

It sits within the nervous system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the medial forebrain bundle connects to

The atlas records 6 typed relationships for it, across 2 kinds of connection. part of brain, central nervous system and hypothalamus, and 1 more.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the medial forebrain bundle. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as MFB, medial forebrain fasciculus, telencephalic medial fasciculus, fasciculus longitudinalis telencephali medialis, fasciculus medialis telencephali and fasciculus medialis telencephalicus, and 3 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001910, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Questions

Where is the medial forebrain bundle?

It sits within the nervous system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What does the medial forebrain bundle connect to?

Part of: brain, central nervous system, hypothalamus and white matter.

Is the medial forebrain bundle the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.